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Finding the Fourth Proportional to 113.53, 170.30 and 51.81

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Solution

The fourth proportional to 113.53, 170.30 and 51.81 is: 77.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.53 : 170.30 = 51.81 : x
  2. Step 2: Convert to fraction form
    113.53/170.30 = 51.81/x
  3. Step 3: Cross multiply
    113.53x = 170.30 × 51.81
  4. Step 4: Simplify right side
    113.53x = 8,823.26
  5. Step 5: Solve for x
    x = 8,823.26/113.53
  6. Step 6: Final answer
    x = 77.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.